Mining Engineers' Handbook, Volume 1Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 2-22
... bearing pyrite is very important , especially in intrusive rocks . When oxidized by meteoric waters in the vadose zone ( belt of weathering ) , all copper - bearing sulphides yield some form of sulphate . This soluble salt , in deposits ...
... bearing pyrite is very important , especially in intrusive rocks . When oxidized by meteoric waters in the vadose zone ( belt of weathering ) , all copper - bearing sulphides yield some form of sulphate . This soluble salt , in deposits ...
Halaman 2-25
... bearing pyrite . The " banket " of gold - bearing conglomerates of Transvaal , the chief producers today , is the best example . C. Saddle - reefs , or arch - like deposits of gold - bearing quartz at crests of anticlines ( e ) ...
... bearing pyrite . The " banket " of gold - bearing conglomerates of Transvaal , the chief producers today , is the best example . C. Saddle - reefs , or arch - like deposits of gold - bearing quartz at crests of anticlines ( e ) ...
Halaman 9-63
... bearing +14 + 11 ° + 6 ° Initial and final bearing veyed Initial bearing Initial bearing Surveyed -- Plan Wire line Swivel- Shock absorbers- Gyroscope Film camera Timing device Batteries Raise for haul back Initial dip Surveyed hole ...
... bearing +14 + 11 ° + 6 ° Initial and final bearing veyed Initial bearing Initial bearing Surveyed -- Plan Wire line Swivel- Shock absorbers- Gyroscope Film camera Timing device Batteries Raise for haul back Initial dip Surveyed hole ...
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angle Ariz aver bench black powder blasting block bottom broken caps cars caving chalcocite chalcopyrite churn drills chutes coal copper core cost per ft cribbed cross-sec crosscuts crystals Data deposits depth diam driven dynamite excavation explosives face filled stopes floor footwall ft deep ft high ft long ft wide fuse gelatin grizzly ground hammer drills hanging wall haulage level hematite hoisting holes horiz igneous rocks inclined intervals iron jackhammers labor lagging limestone loading magnetite manway Mesabi Range method minerals mining mucking orebody pillars pipe porphyry posts powder pump pyrite pyrrhotite quartz quartzite raises rock rods samples sand schist scraper sets shift shovel shrinkage stopes side sill sinking slice sludge soft sphalerite square-set steel stope stulls sub-level sulphide surface Table thick timber tons top-slicing Total tunnel usually veins ventilation waste width